Glass Transitions and the Responsible Molecular Motions in 2-Methyltetrahydrofuran

Mizukami, Mayumi; Fujimori, Hiroki; Oguni, Masaharu

doi:10.1143/ptps.126.79

Cited by 24 publications

(15 citation statements)

References 4 publications

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“…3,18 The latter polymer was additionally studied using polarization noise measurements. 13 However, the van der Waals glass former 2-methyl tetrahydrofuran ͑MTHF͒ with a calorimetric glass transition temperature of 91 K, 19 although repeatedly investigated using solvation spectroscopy via the chromophore quinoxaline, 12 apparently has not been investigated by any of the other abovementioned experimental methods, so far. Therefore the question arises whether or not this substance indeed exhibits a peculiar behavior.…”

Section: Introductionmentioning

confidence: 99%

Nuclear magnetic resonance and dielectric spectroscopy of a simple supercooled liquid: 2-methyl tetrahydrofuran

Goresy

Böhmer

et al. 2003

The Journal of Chemical Physics

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The small-molecule glass former methyl tetrahydrofuran ͑MTHF͒ was investigated using dielectric spectroscopy, spin-lattice relaxometry, multidimensional stimulated-echo nuclear magnetic resonance techniques, and field gradient diffusometry. We show experimentally that MTHF nicely fits into the pattern of related small-molecule glass-forming liquids, including the existence of a high-frequency contribution to the dielectric loss, the appearance of a pronounced translational enhancement, the dominance of small average rotational jump angles, and the existence of short-lived dynamical heterogeneity.

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Section: Introductionmentioning

confidence: 99%

Nuclear magnetic resonance and dielectric spectroscopy of a simple supercooled liquid: 2-methyl tetrahydrofuran

Goresy

Böhmer

et al. 2003

The Journal of Chemical Physics

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“…The temperature dependence of the emission spectra of 1 – 3 and 6 in the glass‐forming solvent, 2‐methyltetrahydrofuran (2‐MTHF, melting point ( T m )=137 K, glass transition temperature ( T g )=91 K) [18] is seen from 293 K to 79 K at 1.0×10 −5 m . Whereas 1 , 2 , and 6 showed only slight changes in the emission spectral shapes in the range of 293–79 K (Figure S20 in the Supporting Information), 3 displayed a unique multi‐step thermochromic emission behavior (Figure 7 and Figure S21 in the Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

Synthesis and Electronic Properties of Directly Linked Dihydrodiazatetracene Dimers

Tanaka

Sakamaki

Fujiwara

2021

Chemistry A European J

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5,12‐Dihydro‐5,12‐diazatetracene (DHDAT) dimers with different substitution patterns are synthesized: a symmetric one with a C−C bond between the monomer units (1) and two asymmetric ones with a C−N bond between the monomer units (2 and 3). The DHDAT units are planar in the C−C linked dimer 1 but perpendicularly oriented in the C−N linked dimers 2 and 3 (from X‐ray analysis). The electronic ground‐state interaction between the two units is large in 1 and small in 2 and 3. The emission behavior of 3 is different from that of other dimers and its monomer; it displays positive solvatochromism, characteristic for electron donor–acceptor molecules, despite its donor–donor type structure. Compound 3 exhibits a unique multi‐step thermochromic emission behavior. The emission behavior is attributed to the asymmetric distribution of the HOMO and LUMO of DHDAT.

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“…with rdep of about 0.2 nm s -1 , and resulting d between 450 nm and 1 µm. The notation Tg refers to the caloric glass transition temperature, which correspond to Tg MTHF = 91 K, 26,27 Tg IPB = 129 K, 19 and Tg NPB = 126 K. 19 The data for MTHF are the results of experiments conducted in the course of a previous study, 18 but this earlier publication does not show all the MTHF data presented here.…”

Section: Please Cite This Article As Doi:101063/15125138mentioning

confidence: 99%

Dielectric properties of vapor-deposited propylbenzenes

Riechers

Guiseppi‐Elie

Ediger

et al. 2019

The Journal of Chemical Physics

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Dielectric susceptibility data of vapor-deposited films of iso-propylbenzene (IPB) and npropylbenzene (NPB) have been recorded across a wide range of deposition temperatures, Tdep, mostly below the glass transition temperature, Tg. The results for the real and imaginary components of dielectric susceptibility are compared with recently published results for 2-methyltetrahydrofuran (MTHF). Common to all three systems are: (i) increased kinetic stability seen as higher onset temperature for the transformation to the liquid state for Tdep  0.85Tg, (ii) the reduction of the dielectric loss ('') for as-deposited glasses, a signature of increased packing density that is maximal for Tdep  0.85Tg, and (iii) a reduced level of the storage component (') for as-deposited glasses, an effect that is almost deposition temperature invariant for Tdep < Tg. Material specific behavior is observed when heating the as-deposited films to 1.2Tg: IPB and NPB transform directly into the ordinary liquid state if judged on the basis of dielectric susceptibility, whereas MTHF has been reported to enter an unusual liquid state prior to a liquid-liquid transition at higher temperatures. These results are discussed in the context of the curious scattering results reported by Ishii et al. for some benzene derivatives, which hint at a liquid-liquid transformation.

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Glass Transitions and the Responsible Molecular Motions in 2-Methyltetrahydrofuran

Cited by 24 publications

References 4 publications

Nuclear magnetic resonance and dielectric spectroscopy of a simple supercooled liquid: 2-methyl tetrahydrofuran

Nuclear magnetic resonance and dielectric spectroscopy of a simple supercooled liquid: 2-methyl tetrahydrofuran

Synthesis and Electronic Properties of Directly Linked Dihydrodiazatetracene Dimers

Dielectric properties of vapor-deposited propylbenzenes

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